function hide(obj) {
        document.getElementById(obj).style.visibility='hidden';
        document.getElementById(obj).style.display='none';
        document.getElementById(obj).style.height='0pt';     
      }

      function show(obj) {
        document.getElementById(obj).style.visibility='visible';
        document.getElementById(obj).style.display='block';
        document.getElementById(obj).style.height='auto';     
      }

function changeBG (obj) {
  document.getElementById(obj).style.bgcolor='white';
}